Emerson 400501-05 Encoder Specifications, Power Dissipation Calculation, Losses Pp Watts

Epsilon Eb Digital Servo Drive Installation Manual

Encoder Specifications

Motor	Density	Output Type	Output	Output Signals	Power Supply
			Frequency
MG	2048	RS422	250 kHz	A, B, Z, Comm U,	5V, 200 mA
		differential		Comm W, Comm V
and NT	lines/rev		per channel		±10%
		driver		and all complements

Power Dissipation

In general, the drive power stages are 90 to 95 percent efficient depending on the actual point of the torque speed curve the drive is operating. Logic power losses on the Epsilon drive are 11 W with normal loads to 15 W with additional loads such as external encoder and low input voltage (<22 VDC on A.P.S. or 120 VAC on AC input).

The values shown in the table below represent the typical dissipation that could occur with the drive/motor combination specified at maximum output power.

Drive Model	Logic Power Losses (typ)	Maximum Power Stage	Total Power Losses (Watts)
	Drive (Pld) (Watts)	Losses (Pp) (Watts)
Eb-202 / MG-205		25	36
Eb-202 / NT-207		25	36
Eb-202 / NT-212		30	41
Eb-203 / NT-207		30	41
Eb-203 / MG-208	11	55	66
Eb-203 / NT-212		55	66
Eb-203 / MG-316		60	71
Eb-205 / NT-212		55	66
Eb-205 / MG-316		72	83
Eb-205 / MG-340		88	99

Power Dissipation Calculation

Calculating actual dissipation requirements in an application can help minimize enclosure cooling requirements, especially in multi-axis systems. To calculate dissipation in a specific application, use the following formula for each axis and then total them up. This formula is a generalization and will result in a conservative estimate for power losses.

TPL	=	TRMS	* Vmax	+ Pld + Psr
		1500

Where:

52